Constraints on Neutrino-Neutrino Interactions from Primordial Nucleosynthesis
Abstract
We use the constraints arising from primordial nucleosynthesis to bound the strength F of non-standard neutrino-neutrino interactions, when the right-handed neutrinos participate in the interaction. We find F < 3 × 10-3\ GF, which is five orders of magnitude more stringent than the limit obtained using LEP data. We also show that secret interactions of neutrinos mediated by massless particles must have a coupling f less than 2 × 10-5. This also ameliorates previous limits in the literature.
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